[RPG] apply Martial Arts Modified Weapon damage on Polearm Master Bonus attack


I am wondering if I can apply Martial Arts Modified Weapon Damage

You can roll a d4 in place of the normal damage of your unarmed strike or monk weapon. This die changes as you gain monk levels, as shown in the Martial Arts column of the Monk table.

To the Bonus action of Polearm master if I am using a quarterstaff instead of dealing d4?

When you take the Attack action and attack with only a glaive, halberd, or quarterstaff, you can use a bonus action to make a melee attack with the opposite end of the weapon. The weapon's damage die for this attack is a d4, and the attack deals bludgeoning damage.

Best Answer

Yes, though you may not want to bother.

The Polearm Master Feat allows you to make an extra attack with the polearm in question as a bonus action- since the extra attack is with the butt end, the attack is treated as coming from a quarterstaff. As you stated, you can substitute damage from a quarterstaff for monk damage... but because Martial Arts already allows you to make an extra attack as a bonus action- granted, an unarmed attack, but it will deal the same damage- you don't gain anything thereby.